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Generally, a healthy stock TT engine can reliable make around 500 whp, give or take. How much boost does it take to get there? Well that depends on lots of factors like turbo size, tune, breather mods and on and on. It might be 25 psi on one setup or 18 psi on another. With the turbos you have mentioned, your intercoolers will bottleneck how much power you can make safely.

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